Safety-valve for tire-pumps and the like.



J. LIEFBROER & J, TENDOLLEN. SAFETY vALvE FOR URE PUMPS AND THE LIKE.

APPUCATION FILED MAY 22. i916.

1,203,754., Patented Nov. 7, 1916 I JOHN LIEFBROER AND JOHN TENDOLLEN, 0F OOSTBURG, WISCONSIN. y

SAFETY-VALVE TIRE-PUMPS AND THE LIKE.

To all inkom t Imay concern Be it known that we, JOHN Liicriinonn and Joinv TnNnonLnN, both citizens of the United States, and residents of Oostburg'. in the county of Sheboygan and State of Wisconsin, have invented certain new and useful Improvements in Safety-Valves for Tire- Pumps and the like; and we do hreby declare that the following is a full. clear, and exact description thereof.

vThe present invention relates to new and useful improvements in safety valves.

In pumping pneumatic tires, considerable inconvenience is encountered in determining the desired degree of pressure attained and considerable danger of blowing out the tire attends the possibility of procuring an excessively great pressure.

It is the object of the present invention to provide a safety valve device which may be associated with tire pumping au'd similar operations for the purpose of relievingv cxcessively high pressure and also for the purpose of indicating` a desired maximum pressure.

It is further an object to provide a Asafety valve device of this nature which is adjustable for operation at different desired pressures.

lt is still further an object to provide such a device which isl of exceedingly simple nature and which is so designed that it may be spliced into a section of flexible tubing7` and remain operative in different relative positions. i

lVith the above and other objects a'nd advantages in'view. the 'invention resides more particularly inthe novel' combination arrangen'ient and formation of parts more particularly hereinafterdescribed and more particularly pointed out in the appended claim.

In the drawings, Figure 1 is a side elevational view of the improved safety valve connectedwith sections of flexible tubing and with portions broken away to more- Fig. 2 is aclearly disclose the structure. top plan view of the device. Fig. 3 is a, transverse sectional view taken' throughthe device on the line 3-3 of Fig. 2 and showing the adjusting band for the spring strip.

Referring now `more particularly -to the l improved safety valve comprises a tubular body 5 ha'vaccompanying' drawings, the

ing its ends reduced and providedfwith circumscribing beads 6 whereby the body may Specification of Letters Patent.

Patented Nov. 7l, isis.-

Application filed May 2, 1916. Serial No. 99,167.

be interposed between sections of rubber or other flexible tubing 7. One side of the body is flattened and one end of this flattened side is provided with a discharge port 8, Secured to the other end of the flattened side oneend. of a sprinw strip 9 which extends longitudinally along` the side and which car'- ries at its other end a valve'head block 10 formed of rubber or similar material providinn- 'for proper engagement with the edge of the port as a seat, and held to the seat bythe resiliency of the spring' strip. Thus the degree of resilient pressure exerted by the strip determines the critical pressure at which the valve will open.A

For varying the resilient pressure of' the strip as desired to meet different'conditions,

lessened particularly inasmuch a's the strip has some tendency to bow outwardly. rilhus the criti lal pressure at which the valve operates may he varied,y and to determine desired degrees of resistance thestrip is provided with series of graduations 13 by which to set the adjusting band 11. The band is locked in desired position by a set screw 14 passed therethrough and engaging the body.

T he present device is particularly adapted for inter-position in the usual flexible pipe of a tire pump,and thus upon the desired degree of pressure being attained the valve` will open to eliminate the danger of blwing out the tire and to indicate the attainment of a desired degree of compression. In view of the simplicity and compactness of the structure, the liability of accidental damage when used in this connection i's considerably lessened'.`

Although the present device has been de-v scribed as particularly adapted for associationwith tire pumping operations. it will be readily understood that various applications may be found for the invention. and that Aisafety valve of theclass describedcom- .prisingtftubular body member providedwith an opening in one end, a-spring strip secured totli'e other end of said body membor and amended adjacent said openilw, a we have hereunto stour hands ut Oostburg, vulve head secured to the leaf 51h-mg and 1nv the county o: Sheboygan and .Stato oi' lo noxmally urged to close tho openlng and a VVlSconsm, 1n. thelprescnce of two mtuescs.

lmud surrounding the tfube and spring und JOHN LllflFljRllH.

5 movable longitudinally thereof, said bund JOHN TENDOLLEN.

hzwngh pol-tion' theroof outwardly offset to Witnesses: recee Said spring strip. JOHN BRE'HOUWER,

ln testimony that We claim the foregoing B. BRETHOUWER. 

